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Find the margin of error for the 95% confidence interval used to estimate the population proportion.
In a survey of 7100 T.V. viewers, 40% said they watch network news programs.
The probability that a house in an urban area will be burglarized is 5%. If 50 houses are randomly selected, what is the probability that one of the houses will be burglarized?
The statistics showed that students studied an average of 20 hours per week with a standard deviation of 10 hours. What is the probability that a sample mean would exceed 20 hours per week?
At the .01 signficance level, can we conclude that there is more variation in the selling prices of the oceanfront homes?
A university's administrator proposes to do an analysis of the proportion of graduates who have not fuond employment in their major field one year after graduation
Perform a significance test to assess whether there is an association between mortality from cirrhosis of the liver and duration of employment in the group hired after 1945. Report a p-value.
Determine the probability that no female are hired. Determine the mean and standard deviation of X.
78 percent of the males attended college. A management trainee is selected at random. What is the probability that the person selected is a female who did attend college?
The Roller Products Company produces roller skates and skateboards. It has three production lines. Production line 1 makes skateboard platforms.
Change the last number in that set from 36 to 14 and recalculate the confidence interval. Using the results, describe the effect of an outlier or extreme value on the confidence interval.
Great Plains Roofing and Siding Company inc, sells roofing and siding products to home repair retailers, such as Lowe's and Home Depot, and commercial contractors.
Normal distribution with a mean value of 150 sec and a standard deviation of 20 sec. The fastest 10% are to be given advanced training. What task times qualify individuals for such training?
Construct a 90 percent confidence interval for the true mean weight. (b) What sample size would be necessary to estimate the true weight with an error of ± 0.03 grams with 90 percent confidence?
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